Melting-furnace.



W. W. CASE, DEGD. N. J. (msi, ADMINISTRATBIX.

MELTING FURNAGE.

APPLIGATIUN FILED APR. 12, 1911.`

Lefl.` A rPatented Jan.2,1912.

alla@ @Para WILLIS W. CASE, F DENVER, COLDRADO; NETTIE J. CASE ADMINISTRATRIX OF SAID WILLIS W. CASE, DECEASE y MELrING-FURNACE.

Spec'ication'of Letters Patent. i

To all whomit may concern: Be it known that I, WILLIS W; CASE, a citizen of the United States, residing at Denver, -in the'county of Deliver and State of Colorado, have invented certain new and useful Improvements in"Melting-Furnaces; and I do hereby declare'the following'to be a full, clear, and eizact. description of the invention, such vas will enable others skilled in the art'to which it appertains to make and use the same. l

This invention relates to melting furnaces especially adapted for melting metals, and has for its object, to improve the, heating means disclosed in my former Patent No. 7 98,950, issued September 5, 1905.

To theseends the invention consists in -'the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out iii the, claims. i Referring lto the accompanying drawings forming apart of this specification in `which like numerals designate likeparts in all the views :hFigure 1 is a longitudinal sectional view of a furnace built'in accordance With my linventioiiyfFig. 2 is a sectional View taken on line 2 2 of. Fig. l; Fig..3 -is a perspective view of .stool or `support foi-fthe metal container disclosed in Fig. 1; Fig. 4 is a detail perspective view of a portion of one of the refractory heaters employed in my furnace; and Fig. 5 is a sectional view of a slightly modiedv form .of `furnace employing my principles.

y1 indicates any suitable iiiqlosiiig Walls, 2 anysuitable 'container for the metal to be melted, preferably in the vform of a crucible as illustrated, and 3 any suitable coverv for the furnace. 4 indicates an opening Withwvhich the cover 3 is'preferably provided, and v5 indicates an inlet for the fuel."

All of the foregoing parts are or maybe of the construction heretofore Well known. Surrounding. the crucible .2 I preferably provide a plurality of refractory heaters 6 vprovided with .checker-like projections 7,

and having crossed channels 8 between said projections, through which the products of combustion may pass. Below thecrucible 2 and the said heaters G'I provide 'asupport or/stoo'l 9 preferably of the foiin shown Y, in Fig. 3, andhaving supporting projections 10 of refractory material. This stool is suitsupported by the casing 1 as shovvn,

'and the products of combustion freely pass between the supports 10 to enter the passages 8 in the heaters 6. Surrounding the stool 9 are additional heaters 12 `provided W'ith projections 1.3 provided with passages 14 for the passage of the productsy of cornbustion between the projections 13- Walls of the casing 1 immediately opposite located marked j, or substantially in the position indicatedby the dotted line 15 in Fig. .l above. toms of the passages 1 4 are located at a considerable distance outside of the dotted y line 1 4, and therefore a considerable space Ais provided through which the products of combustion may pass and become further oxidized before they enter lthe passages 8 of the heaters 6. In vpractice this is ofa considerable advantage' when using-oil fuel,

Inithe present application the l.bot-

\ Patented aan. a', rara In my former patent'above the vertical and forthe reason. that the combustion of oil,` as is Well knowm, is not so rapid, nor is it so perfect, as 1s the combustion of. gas,

and therefore in metallurgical furnaces of this nature it is very desirable to get as per- 1 feet combustion as possible in order to secure' Y amaximum heating. eifect. observed from Fig. 2 that vthe inlet 5 for the fuel is tangentially arranged. This dis`4 'position of, the inlet port enables the oil fuel to circulate around the passages 14 before entering the passages 8, andltherefore per- -mit's a longer timeyfor oxidation beforethe -crucible 2 isreached.4 The 'spacing 0f the supports 1 0 on the stool 9 .is sov choseri as",

to afford a large amount Aof space at `the bottom of the crucible for this combustion to take place, and the result is that any heat which may be liberated at the bottom of the fcrucible is directly available for melting the metal, While the .more perfect combustion which takes place `i-n the passages 8 insures'. Vthat a maximum amount of heat is delivered" to the said crucible 2 before-the gases escape througlithe opening/1: j

4 In the form shown in Fig. 1 tle products Aof combustion pass over the mouth of the. crucible, and should it be-left open as there indicated, the suction from the. escaping gases in some instances is liable to draw out the contents'of the crucible, and should these contents bev valuable such as gold precipitates like those obtained by the cyanid process, the loss is Considerable. In order to avoid such loss the Crucible 20 of the form shown in Fig. may be adopted, in which case the furnace will be correspondingly .form of furnace a heater plate 22 is also slightly modified in shape as shown. Otherwise, the principles of the furnace remain supports on which said lCrucible rests; a pluthe same as in the preceding figures.

In operating a furnace such as that dis- Closed in Fig. 5 the gold precipitates may at intervals-be fed in as the contents melt, until a full Chargeis obtained, When the contents may be discharged inthe usual manner.

`What I claim,I is r*- y l. In a melting furnace the combination of a Crucible; a stool provided with spaced supports on which said Crucible rest-s; a plurality of heater' projections and passages surrounding said Crucible; and a plurality of heater projections surrounding said supi ports, the projectingends of said last named ,projections being located at a greater distance from the central axis of the Crucible than are the bottoms of the lowest of said passages, substantially as described.

- 2. In a melting furnace the combination of a Crucible; a stool provided with spaced rality of .heater projections and passages surrounding said Crucible; a plurality of heater projections surrounding said suppo is, the projecting ends of said last named projections being located at a greater distance from the central axis of the Crucible than are the bottoms of the lowest of said passages; and an inlet adapted to deliver j fuel to the space between said supports, saidA supports being so spaced 'as to provide a free passage for said fuel to said last named projections, substantially as described.

3. In a melting furnace the combination of a Crucible; a stool provided with spaced supports'on Which said crucible'rests; a plurality of heater projections and passages surrounding said Crucible; a pluralityof heater projections surrounding said supports, the projecting ends of .said last named projections being located at a greater distance from the central axis of the Crucible than are the bottoms of the lowest of said passages; and a fuel inlet tangentially entering said furnace below said Crucible and ada pted to vdeliver fuel to the space between said lsupports and vlast named projections, substantially as described.

41. In a melting furnace the Combination 4 of a Crucible having a mouth open to the atmosphere; a passage for vthe exit gases of Combustion located-to one side of said mouth; a stool provided with spaced supports on which said Crucible rests; v,a plurality of "heater projections and passages surrounding said Crucible; a plurality of heater projec- :tions surrounding said supports, the project-` ing ends of said last named projections being located a distance from .the centralt axis of the Crucible greater than are the bottoms of the lowest of said passages; and a fuel inlet tangentially entering said furnace .below said vCrucible and adapted to Cause said fuel to rotate in the space between said supports and last named projections, substantially as described.

In testimony whereof, I ailix signature, in presence of two witnesses.

, WILLIS WV. CASE.

Witnesses:

T. A. WirnnnsrooN.

Gillo. B. Pi'r'rs. 

